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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be08bca87b2b83e6bc7207a368a958544d2286a523c17f5ba0225423d649c31' 
  AND token = 'd2tgSFYJAAVAQ6Ox1ECYYZ0zrX4PrJ2HtrtfxaGNUSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}